Straight bar knitting machine



March 2l, 1933- c. BAUMGRTEL n STRAIGHT BAR KNITTING MACHINE Filed Aug. 22, 1932 w. w S kmmv mv a s@ v4 mm s s Y Mb w Nm mw BO C Y mmv HHHU mm mw m 7W wlmb k .WNK N Nw, m IIN @N f .w r WMQWMQQ x\\\\ n ven /ar.'

Patented Mar.' 21, 1933 CARL BAUMGRTEL, or ZEULBNRODAQEMAY t i' 'srnarenr' BAR xNrrr'INe MACHINE 4 `Application led August 22', 1932,.V Serial No.

This invention relates to straight bar knitting machines having means for moving the needles into or out of the. operative position. i f

In machines 'of this kind, for example when narrowing. or widening the fabric,- the needles which may bedispensed with `or those which are additionally required are moved out of or into the path of the cams. 1 For this purpose it has already been proposed to provide operating jacks for the needles, which jacks may be passed into or out of engagement with the` cams. These jacks, however, are either in insufficient vpositive connection with the needles, orspecial pawls are providedlther'eon, with which the cams arepermitted to engage.` In view of the line divisioning of the needle bed, however, these pawls can only be mounted on the jacks if the latter are correspondingly weakened, 'whereby the pawls themselves also-require to be made considerably weaker, vand thus possessa reduced power of resistance to withstand the attack of the cams. I

It has also been proposed to mountthev needles on special jacks forming the needle passage, and to move the heels of the needles into engagement with the cams by lifting these jacks. This method of mounting the needles, however, does'not permit of a prop-v er positive guidingthereof `in the needle' passage.

It isthe object of the invention to `overcome the disadvantagesreferred to, and this is accomplished Iby lifting and lowering the operating jacks, :for the purpose of moving into or out` of yengagement with the cams, parallel to the walls of the passage by means of auxiliary jacks, which are capable of 4D longitudinal sliding movement, and on which at the same time the operating jacks arecaused to slide, whereby the latter r'e main in continuous engagement with the needle heels.

This arrangement possesses the advantage that the needles alwaysvremain positively coupled` with the operatingjacks, whilst the latter may be constructed in the same thick-` ness as the needles and the auxiliary jacks,

5-0 sogthat even, in the case of extremely fine the longitudinal movement of the'jack 6 Vin 629,957, alla inf'eermnyfjaimary 2e, 19811.i

divisioning of the needle bed the operating, i Jacks maybe passed'securely between'the, high sections of .the-` needle passages and cor-operate with `the cams inexact Vlfashion.k Since .furthermore theoperating andA auXilil ary jacks may bje of thegsame thickness as' f the needles, `the production of all parts is extremely simple.V Y y The invention will now be described more fully with reference to 'the accompanying` drawing, which illustrates theV inventionjinl two possible forms of embodiment. e Fig. 1 is a cross-section through a needle bed of the knitting ma'chinelwith lowered-yy operating jack forthe needle. Y j I VF ig. 2is a similar view to Fig.y 1- with the jack in elevated position. v f i Fig. 3 shows a modified formof Vthe jack arrangement with the jack lowered, and Fig. 4 a similar view toFig. 3.with the jack raised, Al y Inthe bedil the needles Bare guided'in passages 2, and are. secured .inthe known manner by 'a bar 4. The -rneedles possess at; the rear end the upwardly bent hooks 5, which are y'capable of being engaged by the; operating Vjacks through the medium of the slot 7. yThe operating jacks 6 possesslatthe rear end a foot 8, which iscapable o-,cof operating. with the cam 9'. The jack 6 Yisy prevented from being lifted from the lneedle bed byameans of two bars 10 and 1l.v VThe bar 10 at the same time also acts as stop for the one direction,and co-operates', with a 85 projection 12 on the said jack.

The operating jack 6 rests-on aimanuallly shiftable` auxiliary`jack13, whichmay be moved backwards andforwards by meanslof f a projection 14, and is preventedfrombel' inglifted from the needle bed 1 by a' bar 15. This bar 15 acts `simultaneously to'limit the longitudinal movement of the auxiliary jack 1 3.4 This strikes in the advanced po! sition withthe projection 14 againsttherear side of the bar 15, whilstfor the purposeof.

limiting the movement in the vopposite direc-` i tion there is provided von the` auxiliary jack 13 Va projection V16,:whichis capable of mov;

ing against the bar 15 from the opposite l side.

- The operating jack 6 possesses twodownwardly directed projections 17 and 18,

which are furnished towards the needle .jections 25 and 26 on the auxiliary jack 13, which projections nowact as bearing surfacesfor the jack 6; The heel 8 of the jack 6 is now situatedwithinreach of the cam9. v Y

Upon the. advance movement of the jack 6'by the caniV 9 the same slidesJ` on the pro-Y j ections 25 and 26v and is situated in the operative position to move the needles 3 as i required.

' If the jack 6 is to be lowered to such extent that its, projection 8 kno longerprojects beyond the needle bed, and is accordingly situatedv out yof reach lof the cam 9,fthe auxiliary jack'13 is advanced up to the extent of the bar. The projections 17 and 18 then again coincide with the recesses 21 land 22, so that Vthe jackl 6 is lowered against the auxiliary jack 13.

In order, should the jack 6 v become wedged,-to ensure'that the same is proper'- ly lowered, this jack isfurnished at ythe front end'with a sloped projection 27 and at the rear end with an inclinedy portion 28. Against these twoportions 27 and 28 there move ythe sloped portions 29 and 30 'on the auxiliary jack 13, so that these portions, in the extreme position, positively withdraw the jack 6 to such extent as to ensure that the same is moved out of reach of the cam 9. Y

For the purpose of also guiding the auxiliary jack 13 at the front, the projection.

26 may possess a slot 31, which is engagedv by a guide member 32.

According to Figs. 3 and 4, the operating jack 6a is `only about half the length of that in Figs. 1 and 2. The same possesses merely one projection 17aj having an inclined' portion 19a.y In this case the jack 6a, slides only with the one projection 17m on the projection 25a of the auxiliary jack 13a, and may, therefore, readilyy tend tov tip. To avoid thisthe frontend of the jack Gaisr furnished at theV bottom with an abutment 33, by means of which the same, upon the advance movement by the cam, is

able to slide along the bottom of the passage 2a. Upon the `lowering action the abutment moves into a recess 34.in vthe bed. Y This recess 34 passes through the bed 1,'

and is conducted with its front end to such extent below the needles 3 that should a Y needle happen to break, which usually takes place at the bend of thehook 5, the broken part 5 is able to fall downwards out ofthe bed. Y

In the above the jacks according to Figs. 1 and 3 have been` represented as being em iployed each for a particular machine,that

is to. say-V-either 6 or 6a.V It is; possible, however, toemploy both types in the one machine disposed alternately to each other.

In this case the machine requires to be fur-v nished with twovoam systems 9.

Instead of lifting the operating jacks by withdrawing the auxiliary jacks, it is also possible to adopt the reverse method, i. e., vto lift the operating jacks by advancingthe auxiliary jacks.V l f To prevent an unintended'advance` on the part of the auxiliary acks, braking springs may be provided in the needle bed in ther known manner, which springshold the auxiliary jacks in .their extreme positions.

When using two cam systems thefneedles may be of lthe same length; merely the length of the operating jacks varies accord. ingly. 1

It will be understood'that nolimitation is made to the speciic Jforms of embodiment illustrated inthe drawing, which'have been.

quoted merely by way of example, and that various modifications are vquite possible within'the meaning of the above description' and the annexed claimsfwithout departing from the spirit of the invention.

What I claim as new and desire ',to secure by Letters Patent is :7

` 1. In a needle operating mechanism for i' straight bar knitting vmachines, operating jacks for moving the needles, cams for moving the said operating jacks, and longitudinally shiftable auxiliary jacks on which the said operating jacks are `caused to slide, the said operating' jacks being lifted and lowered by the said auxiliary jacksparallel to the walls of the needle passage and remain# ing in continuous .Y engagement with the heels of the needles. j Y

2. In a needle operatingv mechanism for straight bar knitting machines, operating jacks for moving'theneedles', cams for moving the said operating jacks, longitudinally shiftable auxiliary jacks on'which the said operating jacks are caused to slide, projec'- tions on thevsaid auxiliary jacks, and projections having sloped portions onfthe said operating jacks adapted to co-operate with the saidprojections on ther auxiliaryvjacks.

3. In a needle operating mechanism for straight bar knitting machines, operating jacks for moving the needles, cams for moving the said operating jacks, longitudinally shiftable auxiliary jacks on which the said operating jacks are causedto slide, and projections on the said auxiliaryjacks' ,co-o erating With recesses having sloped gui e portions in the said operating jacks. v

4. In a needle operating mechanism for straight bar knitting machines, operating t jacks for moving the needles, cams for moving the said operating jacks, longitudinally shiftable auxiliary jacks on which the said operating jacks are caused to slide, and lahutments on the said operating jacks engaging in recesses in the needle bed.

5. In a needle operating mechanism for straight bar knitting machines, operating jacks for moving the needles, cams for moving the said operating jacks, longitudinally shiftable auxiliary jacks on which the said operating jacks are caused to slide, and'passages in the needle bed for removal ofthe broken vneedles,aloutments on the said operating jacks engaging with the openings of the said passages when the said operating jacks are in their lowered position.

6. In a needle operating mechanism Vfor straight bar knitting machines, operating'` jacks for moving the needles, cams for movl ing the said operating jacks, longitudinally shiftable auxiliary jacks on which the said operating jacks are caused to slide, projec- Y tions having sloped guide portions on the said operating jacks adapted to engage with correspondingly shaped recesses having sloped guide portions in the said auxiliary jacks, and abutments on the said operating jacks engaging in recesses in the needle bed.

In testimony whereof I affix my signature.

[lo CARL BAUMGRTEL. 

